































t i A 6 
cee ue Sst a Nae ae Aas ; vi ‘ Be “ vi 7 
i Cie ae at pa MENG ere a oN: 
ie Exrerntents: WITH Ni URSERY Stoo. 671 — a 
ae Vey a i a 
of water and made. up to fitee ‘or four gallons of thin milk. The ae was ie 
added slowly to the cupric sulphate and the whole made up to twenty-two 
e am . mi 
ged Bordeaux mixture, formula used in 1892. 
2 Die pounds cupric sulphate dissolved in fifteen gallons of water. Two 
eeunids Rhode Island stone lime slaked in small quantity of water and made : 
up to five gallons. The lime was added slowly to the cupric sulphate, testing 
_ the mixture frequently during the addition with a few drops of a concentrated i Me 
" , solution of potassium ferrocyanide (yellow prussiate of potash) and ceasing the = 
addition of the lime when no red color was given to the drops of the ferro-— a 
_ cyanide. For convenience this may be called a sixty-gallon formula, as it 
. _ requires that amount, of water to contain as much copper sulphate as the ; % 
XS ‘standard strength, viz., six pounds. Lak: 
The treatments were pat: in 1891, about three weeks after planting, when 
bg the first leaves were nearly three-fourths grown. The dates upon which the 
: . applications were made were May 21, June 3, June 24, July 9, July 24, August. eS 
8, and August 28. As indicated above in the plan, half of each section was 
treated three times. Those treated three times were sprayed on the first par Pe, 
dates mentioned. va 
_ In 1892, the treatments were begun on May 26, when the leaves had attained 
rin full size, and the first appearance of the disease was observed. The dates of 
_. treatment are, May 26-27, June 15-16, June 23, July 6-7, July 21, and August 5.. 
Kh In order to apply the mixture more thoroughly the spray was passed rapidly 
_ over the plants and the operation repeated after the first spraying had dried.* 
L ~ This method insured as near a complete coating of the fungicide as possible, — 
and it was found that the Bordeaux mixture of this weak strength adhered with 
_ remarkable tenacity, being plainly visible twelve weeks after application.+ %y 
- Care was taken to spray the under side of the leaves on the cherry and plum | 
stocks, but pear, quince and apple stocks were sprayed from above. re 
_ The treatments of 1892 were not continued so late in the season as those of 
1891, and the different sections received respectively five and six sprayings, 
fic er instead of three and six as in 1891, Those receiving five sprayings were treated 
on the first five dates mentioned above. The actual amount of the fungicides as 
. used will be of little value in estimating the quantities that will be necessary 
in treatments on a large scale, but, for the convenience of other experimenters, ? | 
“e _it may be roughly estimated to equal three and one-half to four and one-half 
- gallons of solution per 1,000 one-year-old stocks and proportionately more for 
_ budded stocks. By one-year-old stocks is meant stocks previous to budding, ye 
ae peat ‘The spraying was done with a W. & B. Douglass ‘‘Perfection” knapsack =~ 
sprayer, which proved moderately satisfactory, although ahand-wheelmachine —_— 
a 
is pronid undoubtedly have been better. es 
47 Bike ae vik ie ey 
a r wee * * Suggested first by N. A. Cobb, Dialogue concerning the manner in which a poisonous spray 
it does its work in RT or checking blight. Agricultural Gazette, N. S. Wales, vol. Do tae 
: uf O VR . } 
ae mer? 779-786. Be 
y 4 These double sprayings were made on the first, fourth, fifth and sixth treatments only. G 

